shirt underarm stain

Tuesday, June 19, 2018

The underarms of my husband’s shirts get a waxy like build-up over time. I guess it is a mixture of sweat and deodorant. (He will not change his deodorant.) I have tried spraying with white vinegar, bicarb soda, tea tree oil, soaking. Can you suggest any way of treating shirts from new to prevent this happening. Thank you.